The Earth is a prison, and the mega corporations are its wardens. The 3rd Great War wiped the world’s superpowers off the board, leaving the planet’s surface uninhabitable under the weight of nuclear fallout. As entire civilizations crumbled, the mega corporations seized the moment—lifting what remained of humanity off the irradiated ground into the SKYLIGHTS, massive floating megacities built to preserve civilization. But salvation came at a price. Now ruling from above, the mega corporations seek to keep humanity confined to the skies, suppressing any attempt to leave Earth behind and reach for the stars. For as long as the world remains a cage, their rule remains absolute. ... Or at least, that's what a certain mecha game's story was about. An unlucky player who was invited to alpha test this game found himself transported into its world as his character. Now a member of a rebel organization, Richter must fight to survive in an EXOD. "Alright~ Richter. EXOD Unit 01, launching!"